**1. Introduction**

342 Biogas

Yu, H. Q., Fang, H. H. P., & Gu, G. W. (2002). Comparative Performance of Mesophilic and

447-454, ISSN 1359-5113

Thermophilic Acidogenic Upflow Reactors. *Process Biochemistry*, Vol. 38, No. 3, pp.

The chapter concerns with the constructions of the commercial biogas plants as well as the small and household units. Furthermore, the chapter aims at providing a clear description of the structures and constructions of the anaerobic digesters and the used building materials. Ultimately, the chapter answers an important question: how to build a commercial biogas plant and a household unit, and what are the construction steps?
